One of Boston’s biggest employers, Fidelity Investments, is offering workers just-in-case prescriptions for flu-fighting medication, a practice that has provoked the wrath of public health specialists concerned about overuse of such drugs.

Internal memos obtained by the Globe show the company is enlisting a private physicians group to evaluate workers and write prescriptions for the drug Tamiflu, which can shorten the severity and duration of influenza. The prescriptions are being filled by a mail-order pharmacy, and everything is paid for by Fidelity.

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